On October 20, 2026, EMC 2026 opened in Shanghai. Jiangsu WEMC Electronic Technology Co., Ltd. participated in the technical exchange events held concurrently with the exhibition. Ran Lu from our Marketing Team delivered a keynote speech titled "Technical Characteristics and Applications of PV Filters in EMC Testing", discussing filter technologies and practical deployment for EMC testing of photovoltaic inverters with on-site experts and industry peers.
Focused on Practical Applications: Addressing Challenges in PV Filter Design
During EMC testing of photovoltaic inverters, a key consideration in filter selection and design lies in effectively suppressing background noise from the test power supply while guaranteeing normal operation of the inverter's insulation monitoring function.
Conventional high-performance DC filters generally adopt large ground capacitance to enhance high-frequency interference attenuation. However, within photovoltaic inverter test systems, excessive ground capacitance may interfere with insulation detection during inverter startup, resulting in failed equipment activation and disrupted testing procedures.
To tackle this practical application challenge, the presentation drew on project experience accumulated by WEMC's technical team and outlined technical approaches for PV filters to achieve effective noise suppression under constraints of low ground capacitance.
Balancing Filtering Performance and System Compatibility
Centered on the design and application of PV filters, the speech highlighted the following key aspects:
- Insulation Monitoring Compatibility: Properly define the ground capacitance of the filter in accordance with the inverter's insulation detection requirements and the ground network conditions of the test system.
- Background Noise Suppression: Leverage the interference characteristics of PV power supplies to improve filtering performance with limited ground capacitance, by optimizing filter circuit topologies, common-mode and differential-mode inductors, and impedance matching.
- Safety and Reliability: Ensure reliable filter operation under high-voltage and high-current operating conditions through electrical insulation design, component selection, temperature rise control, manufacturing processes and quality validation.
- Customized Applications: Deliver tailored product design and technical support based on the voltage, current, noise floor, installation constraints and acceptance criteria of the customer’s actual test platform.
The presentation also covered WEMC's project track record in high-current DC filters, alongside technical strategies for product selection and custom development for diverse test systems.
Deeply Engaged with Application Requirements to Foster Continuous Technical Exchange
Driven by advances in photovoltaic, energy storage and new energy vehicle industries, power ratings and testing specifications for relevant power electronic equipment keep rising. EMC test systems impose increasingly sophisticated requirements on power filters in terms of performance, compatibility and reliability.
WEMC specializes in EMC filter technology and applications, boasting extensive product development and project delivery experience in high-voltage, high-current filter solutions. Supported by mature technical solutions, robust production and quality management systems, and in-depth insights into complex application scenarios, the company offers comprehensive services ranging from standard product supply to sophisticated custom design. Its products feature a maximum rated current of 6000A.
Going forward, WEMC will continue leveraging its technical strengths and experience in EMC filtering to further enhance product performance, reliability and system adaptability. The company is committed to supplying high-quality, dependable EMC filtering solutions for global customers and advancing industrial progress through professional technical expertise.